I use 661 cause they are the best. You can find killer deals on 661 gear on ebay.
You also might want to take a trip to your local pawn shops. Great deals to be had there.
When it comes to armor you do get what you pay for. In other words DON'T GO CHEAP!
If you reallywant to shell out the major cash then you go with cockroach High Impact Armor. But it will cost you a pretty penny for it.
Fox makes a good Motocross armor too. It just all depends on how much cash you want to shell out.
Check out eBay for killer deals.
My husband is the one that buys all our safety gear for us and the boys. I don't think that he stays with one particular manufacter though.
I would agree with the above poster that I wouldn't go cheap though. I have seen some cheaply made stuff over the years.